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-rw-r--r--ext/tk/lib/tk/scrollable.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/scrollable.rb b/ext/tk/lib/tk/scrollable.rb
index 96959b7a4b..e9b4a93d6d 100644
--- a/ext/tk/lib/tk/scrollable.rb
+++ b/ext/tk/lib/tk/scrollable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/scrollable.rb : module for scrollable widget
#